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While     in Scotland, he made friends with the natives there.
A.workingB.workedC.he worksD.he is working
:A
:考查状语从句的省略。当状语从句的主语和主句主语一致的时候,且谓语动词为be动词时,可以把状语从句的主语和be动词一起省略。本题在while于working之间省略了he was.因为he和work构成主动关系,所以使用现在分词的形式。D项错在时态不对。
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